使用 Python Pandas 对列进行分箱 [英] Binning a column with Python Pandas
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问题描述
我有一个带有数值的数据框列:
I have a data frame column with numeric values:
df['percentage'].head()
46.5
44.2
100.0
42.12
我想将该列视为 bin 计数:
bins = [0, 1, 5, 10, 25, 50, 100]
如何将结果作为带有值计数的 bin 获得?
How can I get the result as bins with their value counts?
[0, 1] bin amount
[1, 5] etc
[5, 10] etc
...
推荐答案
您可以使用 pandas.cut
:
You can use pandas.cut
:
bins = [0, 1, 5, 10, 25, 50, 100]
df['binned'] = pd.cut(df['percentage'], bins)
print (df)
percentage binned
0 46.50 (25, 50]
1 44.20 (25, 50]
2 100.00 (50, 100]
3 42.12 (25, 50]
bins = [0, 1, 5, 10, 25, 50, 100]
labels = [1,2,3,4,5,6]
df['binned'] = pd.cut(df['percentage'], bins=bins, labels=labels)
print (df)
percentage binned
0 46.50 5
1 44.20 5
2 100.00 6
3 42.12 5
bins = [0, 1, 5, 10, 25, 50, 100]
df['binned'] = np.searchsorted(bins, df['percentage'].values)
print (df)
percentage binned
0 46.50 5
1 44.20 5
2 100.00 6
3 42.12 5
...然后value_counts
或 groupby
并聚合 尺寸
:
s = pd.cut(df['percentage'], bins=bins).value_counts()
print (s)
(25, 50] 3
(50, 100] 1
(10, 25] 0
(5, 10] 0
(1, 5] 0
(0, 1] 0
Name: percentage, dtype: int64
s = df.groupby(pd.cut(df['percentage'], bins=bins)).size()
print (s)
percentage
(0, 1] 0
(1, 5] 0
(5, 10] 0
(10, 25] 0
(25, 50] 3
(50, 100] 1
dtype: int64
默认cut
返回categorical
.
Series
方法如 Series.value_counts()
将使用所有类别,即使数据中不存在某些类别,分类操作.
Series
methods like Series.value_counts()
will use all categories, even if some categories are not present in the data, operations in categorical.
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